______,Beat the egg whites with a pinch of salt in a large mixing bowl and gradually add the sugar, beating as fast as you can until whites form stiff peaks.,Add lemon juice to the apple puree in another large bowl.,Stir in a little of the beaten egg whites, and finally fold in the rest of the whites until well blended.,Pour into a glass bowl to serve, and sprinkle with a pinch of cinnamon on top.